Prothrombin is a clotting factor in blood (it speeds up blood clotting). A study was conducted to see how the time it to

[answerhappygod]

Prothrombin is a clotting factor in blood (it speeds up blood
clotting). A study was conducted to see how the time it took for
blood to clot varied as blood was mixed with plasma that had
Prothrombin removed. The R output below shows the result of a
linear regression of clotting time on concentration of
Prothrombin-free plasma (conc is measured in percent, from 0
to 100, and time is measured in seconds).
Based on the R output, answer the following questions. Only
enter numbers, not units, and give all answers to the nearest whole
second.